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    <title>clEnqueueWriteImage</title>
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      <div xmlns="" class="refnamediv">
        <a xmlns="http://www.w3.org/1999/xhtml" id="clEnqueueWriteImage"></a>
        <h1>     
            clEnqueueWriteImage
        </h1>
        <p>          
            Enqueues a command to write from a 2D or 3D image object to host memory. 
        </p>
      </div>
      <div class="refsynopsisdiv">
        <h2></h2>
        <div class="funcsynopsis">
          <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
            <tr valign="bottom">
              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
                    <a class="link" href="scalarDataTypes.html" target="_top">cl_int</a>
 <strong class="fsfunc">clEnqueueWriteImage</strong>
                (</code>
                <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="_top">cl_command_queue</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">command_queue</var>, </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="_top">cl_mem</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_bool" target="_top">cl_bool</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">blocking_write</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">origin</var>[3], </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">region</var>[3], </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">input_row_pitch</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">input_slice_pitch</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">void</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">* ptr</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">cl_uint</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_events_in_wait_list</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="_top">cl_event</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*event_wait_list</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="_top">cl_event</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*event</var><code>)</code></td>
            </tr>
          </table>
        </div>
      </div>
      <div class="refsect1">
        <a id="parameters"></a>
        <h2>Parameters</h2>
        <div class="variablelist">
          <dl class="variablelist">
            <dt>
              <span class="term">
                    <code class="varname">
						command_queue
                    </code>
                </span>
            </dt>
            <dd>
              <p> 
						Refers to the command-queue in which the write command will be
						queued. <code class="varname">command_queue</code> and image must be created with the same OpenCL contex 
                    </p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname">
						image
                    </code>
                </span>
            </dt>
            <dd>
              <p>
						Refers to a valid 2D or 3D image object.
                    </p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname">
						blocking_write
					</code>
				</span>
            </dt>
            <dd>
              <p>
						Indicates if the write operation is <code class="varname">blocking</code> or <code class="varname">non-blocking</code>.
					</p>
              <p>
						If <code class="varname">blocking_write</code> is <code class="constant">CL_TRUE</code> the OpenCL implementation copies the data referred to by <code class="varname">ptr</code> and enqueues the write command in the command-queue. The memory pointed to by <code class="varname">ptr</code> can be reused by the application after the <code class="function">clEnqueueWriteImage</code> call returns.
					</p>
              <p>
						If <code class="varname">blocking_write</code> is <code class="constant">CL_FALSE</code> the OpenCL implementation will use <code class="varname">ptr</code> to perform a nonblocking write. As the write is non-blocking the implementation can return immediately. The memory pointed to by <code class="varname">ptr</code> cannot be reused by the application after the call returns. The <code class="varname">event</code> argument returns an event object which can be used to query the execution status of the write
command. When the write command has completed, the memory pointed to by <code class="varname">ptr</code> can then be reused by the application.
					</p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname">
						origin
                    </code>
                </span>
            </dt>
            <dd>
              <p>
						Defines the (<span class="emphasis"><em>x, y, z</em></span>) offset in pixels in the image from where to write or write. If <code class="varname">image</code> is a 2D image object, the z value given by <code class="varname">origin</code>[2] must be 0.
                    </p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname">
						region
                    </code>
                </span>
            </dt>
            <dd>
              <p>
						Defines the (<code class="varname">width</code>, <code class="varname">height</code>, <code class="varname">depth</code>) in pixels of the 2D or 3D rectangle being write or written. If <code class="varname">image</code> is a 2D image object, the <code class="varname">depth</code> value given by <code class="varname">region</code>[2] must be 1.
                    </p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname">
						input_row_pitch                    
					</code>
                </span>
            </dt>
            <dd>
              <p> 
						The length of each row in bytes. This value must be greater than or equal to the element size in bytes * <code class="varname">width</code>. If <code class="varname">input_row_pitch</code> is set to 0, the appropriate row pitch is calculated based on the size of each element in bytes multiplied by <code class="varname">width</code>.
                    </p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname">
						input_slice_pitch
					</code>
				</span>
            </dt>
            <dd>
              <p>
						Size in bytes of the 2D slice of the 3D region of a 3D image being written. This must be 0 if <code class="varname">image</code> is a 2D image. This value must be greater than or equal to <code class="varname">row_pitch</code> * <code class="varname">height</code>. If <code class="varname">input_slice_pitch</code> is set to 0, the appropriate slice pitch is calculated based on the <code class="varname">row_pitch</code> * <code class="varname">height</code>.
					</p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname">
						ptr
					</code>
				</span>
            </dt>
            <dd>
              <p>
						The pointer to a buffer in host memory where image data is to be read from.
					</p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname">
						event_wait_list
					,</code>
					<code class="varname">
						num_events_in_wait_list
					</code>
				</span>
            </dt>
            <dd>
              <p>
						Specify events that need to complete before this particular command can be executed. If <code class="varname">event_wait_list</code> is NULL, then this particular command does not wait on any event to complete. If <code class="varname">event_wait_list</code> is NULL, <code class="varname">num_events_in_wait_list</code> must be 0. If <code class="varname">event_wait_list</code> is not NULL, the list of events pointed to by <code class="varname">event_wait_list</code> must
 be valid and <code class="varname">num_events_in_wait_list</code> must be greater than 0. The events specified in <code class="varname">event_wait_list</code> act as synchronization points. The context associated with events in <code class="varname">event_wait_list</code> and <code class="varname">command_queue</code> must be the same.
                    </p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname">
						event
					</code>
				</span>
            </dt>
            <dd>
              <p>
						Returns an event object that identifies this particular write command and can be used to
						query or queue a wait for this particular command to complete. <code class="varname">event</code> can be NULL in which
						case it will not be possible for the application to query the status of this command or queue a
						wait for this command to complete. 		
					</p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
Calling <code class="function">clEnqueueWriteImage</code> to update the latest bits in a region of the image object with the
<code class="varname">ptr</code> argument value set to <code class="varname">host_ptr</code> + (<code class="varname">origin</code>[2] * <code class="varname">image slice pitch</code> + <code class="varname">origin[1]</code> * <code class="varname">image row pitch</code>
+ <code class="varname">origin[0]</code> * <code class="varname">bytes per pixel</code>), where <code class="varname">host_ptr</code> is a pointer to the memory region specified when
the image object being written is created with <code class="constant">CL_MEM_USE_HOST_PTR</code>, must meet the
following requirements in order to avoid undefined behavior:
		</p>
        <div class="itemizedlist">
          <ul class="itemizedlist" style="list-style-type: disc; ">
            <li class="listitem" style="list-style-type: disc">		
The host memory region being written contains the latest bits when the enqueued write
command begins execution.
			</li>
            <li class="listitem" style="list-style-type: disc">
				The <code class="varname">input_row_pitch</code> and <code class="varname">input_slice_pitch</code> argument values in <code class="function">clEnqueueWriteImage</code> must be set to
				the image row pitch and slice pitch.
			</li>
            <li class="listitem" style="list-style-type: disc">
				The image object is not mapped.
			</li>
            <li class="listitem" style="list-style-type: disc">
				The image object is not used by any command-queue until the write command has
				finished execution.
			</li>
          </ul>
        </div>
      </div>
      <div class="refsect1">
        <a id="errors"></a>
        <h2>Errors</h2>
        <p>
			<code class="function">clEnqueueWriteImage</code> return <span class="errorname">CL_SUCCESS</span> if the function is
			executed successfully. Otherwise, it returns one of the following errors.
		</p>
        <div class="itemizedlist">
          <ul class="itemizedlist" style="list-style-type: disc; ">
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_COMMAND_QUEUE</span> if <code class="varname">command_queue</code> is not a valid command-queue.
			</li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_CONTEXT</span> if the context associated with <code class="varname">command_queue</code> and <code class="varname">image</code>
				are not the same or if the context associated with <code class="varname">command_queue</code> and events
				in <code class="varname">event_wait_list</code> are not the same.
			</li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_MEM_OBJECT</span> if <code class="varname">image</code> is not a valid image object.
			</li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if the region being write or written specified by <code class="varname">origin</code> and <code class="varname">region</code>
				is out of bounds or if <code class="varname">ptr</code> is a NULL value.
			</li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">image</code> is a 2D image object and <code class="varname">origin</code>[2] is not equal to 0 or
				<code class="varname">region</code>[2] is not equal to 1 or <code class="varname">slice_pitch</code> is not equal to 0.
			</li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_EVENT_WAIT_LIST</span> if <code class="varname">event_wait_list</code> is NULL and
				<code class="varname">num_events_in_wait_list</code> greater than 0, or <code class="varname">event_wait_list</code> is not NULL and
				<code class="varname">num_events_in_wait_list</code> is 0, or if event objects in <code class="varname">event_wait_list</code> are not valid events.
			</li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_MEM_OBJECT_ALLOCATION_FAILURE</span> if there is a failure to allocate memory for
				data store associated with <code class="varname">image</code>.
			</li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_HOST_MEMORY</span> if there is a failure to allocate resources required by the
				OpenCL implementation on the host.
			</li>
          </ul>
        </div>
      </div>
      <div class="refsect1">
        <a id="specification"></a>
        <h2>Specification</h2>
        <p>
            <img src="pdficon_small1.gif" />
			
				      
            <a href="http://www.khronos.org/registry/cl/specs/opencl-1.0.pdf#page=67" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="clEnqueueReadImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReadImage</span></span></a>, 
			<a class="citerefentry" href="clEnqueueCopyImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyImage</span></span></a>
        </p>
      </div>
      <div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2009 The Khronos Group Inc. 
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
permit persons to whom the Materials are furnished to do so, subject to
the condition that this copyright notice and permission notice shall be included
in all copies or substantial portions of the Materials. 
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